Monday, April 29, 2019

2020 Mercedes Benz Truck ML 350 Technical Service Bulletin # S-54_21-234A Date: 101026

2020 Mercedes Benz Truck ML 350 Technical Service Bulletin # S-54_21-234A Date: 101026



Electrical - Aftermarket Tampering Malfunctions



Date: October 26, 2010



Order No.: S-B-54.21/234a



Supersedes: S-B-54.21/234, dated July 27, 2010



Group: 54



Revision History



Revision Date Purpose



a 10/22/10 Additional devices and pictures added.



- 7/27/10 Initial issue



SUBJECT: MY- All, Models All



Malfunctions Due to Other-Make Installations



Recent attempts manipulating vehicle mileage through the use of third party electronic devices installed on Mercedes-Benz vehicles are being



reported.



There are several CAN manipulation devices on the market. Be particularly aware of two devices which are installed in tandem with the instrument



cluster or the EIS (Figure 1) and a circuit board which can be installed directly within the EIS (Figure 2).



2020 Mercedes Benz Truck ML 350 4MATIC (164.186) V6-3.5L (272.967) Page 143



If vehicle electronics malfunction, control units display implausible mileage readings, or malfunctions lack corresponding default entries; check the



vehicle for non-factory hardware. These are often installed in the interior wiring harness of the vehicle. Another example would be the TV enable



module for the COMAND APS NTG2 in Figure 3.



Possible malfunctions are:



^ Random unlocking or locking of the vehicle while driving



^ Temporary or continuous hazard warning system activation



^ Sudden mileage increase in the IC



If there is evidence that the vehicle has been tampered with (mileage altering device, aftermarket installation etc) please provide as much supporting



documents (pictures, test results, etc.) and send an email with the supporting documents to the Warranty Services Group and request that the vehicle



be put on warranty status.



Warranty will determine the correct status to be applied (usually status 8 which requires AOM review before any repairs are performed), file the



supporting documentation and add notes into our vehicle master system.



Any vehicle with a warranty status will have an alert box pop up when VMI is run to inform the dealer of this status.



Any malfunctions or subsequent damage to other parts due to the installation of foreign parts are not covered by Warranty. The repair costs should



be charged to the customer.

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